An agent application program attempted to return a CMIP error and CMIP services flagged the response as illegal because the error code specified in the response is not allowed for indications of the type being responded to. For example, if an client agent application program returns a getListError for an m-Set indication or an invalidArgumentValue error for a an m-Create. This error is also returned by CMIP services when an agent responds to a delete with the syntax MIB.DeleteResponse(1, X, ...) where the X is an error code that is not allowed by the CMIP standard in response to an m-Delete indication.